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WATCH: Princess Eugenie forgets words to Beyonce song during concert

Princess Eugenie may be sixth in the line of succession to the British throne, but she's no Queen Bey. According to "The Mirror," Eugenie - daughter of Prince Andrew and Sarah Ferguson and cousin to Princes William and Harry - had an embarrassing moment during Beyonce's concert in London on Tuesday night.

Video footage shows Beyonce working the stage during her hit "Irreplaceable" and bending down at random to select audience members to sing along with the song's well-known lyric, "To the left, to the left." The 23-year-old princess was seated front row, and was reportedly mortified when she buckled under the pressure and couldn't remember the words.

A concertgoer tells the paper Eugenie went "bright red" and "ducked down" while "filming the whole thing on her iPhone like any other fan."

The princess reportedly attended the concert in a group with Kate Middleton's brother James, and fashion designers Matthew Williamson and Patrick Cox.